C/2016 M1 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	24 Jun 2018	8.7	2.271 AU	1.290 AU	18h09m	-43°28'	159.9°	8.8°	1°
Perihelion	8 Aug 2018	9.2	2.212 AU	1.758 AU	15h01m	-57°50'	102.5°	26.6°	101°
Today	16 Dec 2025	26.5	19.278 AU	18.318 AU	06h11m	+13°13'	166.5°	0.7°	320°

The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 3.5 + 5 log[∆] + 13.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Orbital elements

The orbital elements of C/2016 M1 (PANSTARRS) are:

    e (Eccentricity)                : 0.9990420
    q (Perihelion distance)         : 2.2117990
    i (Inclination)                 : 90.73190
    Ω (Longitude of ascending node) : 92.29830
    ω (Argument of perihelion)      : 209.84400
    L (Longitude of perihelion)     : 91.87841
    B (Latitude of perihelion)      : -29.84132
    T (Time of perihelion passage)  : 2458338.54810
    P (Orbital period in years)     : 110935.42

    Epoch                           : 2025 Dec 15
    Reference                       : MPEC 2022-ED3

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-15 00:00 UT   06 11 53.6   +13 12 53    18.316   19.272  165.7    0.7   316   26.5 
2025-12-16 00:00 UT   06 11 40.3   +13 13 13    18.318   19.277  166.5    0.7   319   26.5 
2025-12-16 02:05 UT   06 11 39.1   +13 13 15    18.318   19.278  166.5    0.7   320   26.5 
2025-12-17 00:00 UT   06 11 26.9   +13 13 34    18.321   19.282  167.1    0.7   323   26.5 
2025-12-18 00:00 UT   06 11 13.5   +13 13 55    18.324   19.287  167.8    0.6   327   26.5 
2025-12-19 00:00 UT   06 11 00.1   +13 14 17    18.327   19.293  168.3    0.6   331   26.5 
2025-12-20 00:00 UT   06 10 46.7   +13 14 39    18.331   19.298  168.8    0.6   336   26.5 
2025-12-21 00:00 UT   06 10 33.2   +13 15 02    18.335   19.303  169.2    0.5   341   26.5 
2025-12-22 00:00 UT   06 10 19.8   +13 15 26    18.339   19.308  169.5    0.5   347   26.5 
2025-12-23 00:00 UT   06 10 06.3   +13 15 50    18.344   19.313  169.7    0.5   353   26.5 
2025-12-24 00:00 UT   06 09 52.8   +13 16 14    18.349   19.319  169.8    0.5   359   26.5 
2025-12-25 00:00 UT   06 09 39.4   +13 16 40    18.354   19.324  169.8    0.5     5   26.5 
2025-12-26 00:00 UT   06 09 25.9   +13 17 05    18.360   19.329  169.7    0.5    11   26.5 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.